You are always looking at data through a form or a page. But what if you want to see all the data for this customer record even if it is not displayed on the card? For this you can use the zoom feature to see every field. Press Ctrl+F8 in classic and using the About This Page menu (Ctrl+Alt+F1) in RTC.
For example, the customer card looks like this with the form, then the page.
The zoomed data will show everything recorded for this customer (RTC is shown first this time – just testing). This is a great way to diagnose issues and to report problems to your support staff. I use this a lot during testing